Vijay Nair

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The modeling and analysis of computer communications networks give rise to a variety of interesting statistical problems. This paper focuses on network tomog-raphy, a term used to characterize two classes of large-scale inverse problems. The first deals with passive tomography where aggregate data are collected at the individual router/node level and the(More)
Health behavior intervention studies have focused primarily on comparing new programs and existing programs via randomized controlled trials. However, numbers of possible components (factors) are increasing dramatically as a result of developments in science and technology (e.g., Web-based surveys). These changes dictate the need for alternative methods(More)
This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Abstract—A 900 MHz meander PIFA on a magneto-dielectric nanocomposite (MDNC) substrate for mobile communication is presented. Cobalt nanoparticles were synthesized with polymer matrix and its(More)
Identifying the spatio-temporal network structure of brain activity from multi-neuronal data streams is one of the biggest challenges in neuroscience. Repeating patterns of precisely timed activity across a group of neurons is potentially indicative of a microcircuit in the underlying neural tissue. Frequent episode discovery, a temporal data mining(More)
— Magnetodielectric (MD) materials find application in many areas of microwave engineering, and therefore, measurement of their dielectric and magnetic properties is very important. This paper presents a novel MD material characterization method using the cavity perturbation technique (CPT) with substrate-integrated waveguide (SIW) cavity resonators.(More)
Magneto-dielectric materials have been spotlighted as a new opportunity for effective antenna size reduction in many recent studies. In this paper, we start from first principles to describe the methodology used to synthesize the magneto-dielectric material. A combination of Bruggeman's effective medium model and Sihvola and Lindell model are used to find(More)
This paper demonstrates, for the first time, a Wireless Local Area Network (WLAN) radio frequency (RF) front end module (FEM), incorporating the smallest, high-performance band-pass filter (BPF) on a 110µm-thin organic substrate with chip-last embedded actives and thin-film passives. The FEM consists of a power amplifier (PA) die, a switch die, and two(More)
BACKGROUND Participant engagement influences treatment effectiveness, but it is unknown which intervention design features increase treatment engagement for online smoking cessation programs. OBJECTIVE We explored the effects of 4 design features (ie, factors) on early engagement with an Internet-based, motivational smoking cessation program. METHODS(More)
BACKGROUND Web-based programs for health promotion, disease prevention, and disease management often experience high rates of attrition. There are 3 questions which are particularly relevant to this issue. First, does engagement with program content predict long-term outcomes? Second, which users are most likely to drop out or disengage from the program?(More)
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